- Edited
Don't know if that helps or not. 
I've looked all over the heads and can't find anything. Gonna clean them up this afternoon and see if that uncovers anything.
Taylormade M5 iron- Serial Number location?
Look on the back of the hosel between the 2 bending notches. You may need a magnifying glass and good lighting to see the number because they’re so small. My M5 irons, which I bought directly from TM, have the numbers there.
The 7-iron.......
JeffTilley thanks! It did take a magnifying glass but it's there. 
Thanks for not making a liar out of me. LOL
Well, his pics didn’t show the back of the hosel, so you’re good, lol.....
What shafts you have in yours? I have KBS Tours in mine and the heavier weight seems to have helped my accuracy somewhat. A little more practice and/or play would probably help me even more, lol.
Somebody been sanding on those?
JeffTilley Tensei graphite. Reg flex.
LBlack14 I'll blame it on dirty clubs and bad lighting...